03'55AMG

I recently replaced my IC pump due to high temps and no S/C. although after the change, temps did not recede to normal. So in suspecting that it was the wiring, not the pump, I hooked up my old 'dead' pump up to 12 volts, and to my surprise it ran. instantly, no delay no cut outs nothing. perfectly good pump. so now im going to have to find where the power is being is cut off. any body have diagrams, fuse #s, relay locations, or any advice at all?

tbal

Did you ever solve this problem?

03'55AMG

I found a blown 15 A fuse that I thought was it, but no. Still trying to find where power is being cut off

Hellzno

stock wiring the pump only comes on when ecu tells it to. Not sure exactly when.
so when I replaced my pump i could not tell when pump would come on. I hard wired to be always on.

tbal

I did the same today and it made a HUGE improvement!

Is it bad for the pump? Im assuming it wont last no where as long lol...

Hellzno

i think the longevity for the pump depends on what pump you are using. i switched from stock to johnson cm30. I read the specs on the johnson website for temperature longevity it was pretty long time. The johnson pump is cheap enough for me to let run when key is on. I figured it is better to keep the intake air temps as low as possible all the time rather then when the ecu thinks it should kick on pump. I use the REV app on my iphone to check every now and then to look at IAT's to make sure pump is still working.

tbal

True enough. At $132 for the updated Bosch I'm just buy one for
Backup lol.